Hereditary Breast and Ovarian Cancer

What Is Hereditary Breast and Ovarian Cancer?

Hereditary breast and ovarian cancer (HBOC) is a familial condition that occurs in men and women due to mutations in BRCA1 (breast cancer 1) and BRCA2 (breast cancer 2), and other cancer genes.

It can affect both men and women of any race or ethnic background. Mutations in these genes increase the risk of a woman developing breast and ovarian cancer even before age 50.

And men with such a mutation are at risk of developing prostate cancer, male breast cancer, and, in some people, pancreatic cancer.

Having these genes does not necessarily increase the cancer risk, but it increases the chances of getting cancer. Genetic testing and counseling help identify HBOC and provide preventive measures to lower cancer risk.

What Causes Hereditary Breast and Ovarian Cancer?

Hereditary breast and ovarian cancer occurs due to BRCA1 and BRCA2 gene mutations. These genes normally protect cells by repairing DNA damage, but when they are mutated, the risk of cancer occurrence rises.

However, not all families with a strong history of breast or ovarian cancer have identifiable BRCA1 or BRCA2 mutations. In some cases, other genes known or unknown also play a role in causing HBOC.

You must know that having a BRCA1 or BRCA2 gene mutation does not mean you will have cancer; it means that it will increase your risk. But the good news is, genetic testing and counseling help you gain a clear understanding of your risk and help you take proactive steps to prevent cancer and protect your health.

What Is the Chance of Developing Cancers for Those With Inherited Ovarian and Breast Cancers?

A person’s age, cancer type, and whether they carry a BRCA1 or BRCA2 gene mutation all affect their overall cancer risk. People with HBOC have a much higher chance of developing certain cancers when compared to others, and sometimes more than one type of cancer, such as:

1. Breast Cancer: In the general population, about 12 percent of women will get breast cancer during their lives. For women with a BRCA1 mutation, the risk rises to 55 to 70 percent, and for BRCA2 mutation carriers, it is 45 to 70 percent.

2. Ovarian Cancer: Around one percent of women develop ovarian cancer. This risk increases to about 40 percent for BRCA1 carriers and 15 percent for BRCA2 carriers.

3. Prostate Cancer: For men with BRCA1 mutations, the risk of prostate cancer is about 15 to 25 percent, and for BRCA2 mutations, it is 30 to 40 percent. While in general, the male population has a 14 to 19 percent lifetime risk.

4. Male Breast Cancer: Normally, men have only about a 0.1 percent chance of developing breast cancer. For BRCA1 carriers, this risk increases to one percent, and for BRCA2 carriers, up to eight percent.

5. Pancreatic Cancer: The average lifetime risk is about 1.5 percent. This increases to two to four percent for BRCA1 carriers and around five percent for BRCA2 carriers.

Who Is at Risk of Hereditary Breast and Ovarian Cancer Syndrome?

Researchers estimate that about one in every 300 to 800 people carries a harmful mutation in the BRCA1 and BRCA2 genes. However, the likelihood is much higher in certain groups.

For example, among Ashkenazi Jewish individuals, about one in 40 carries a BRCA1 or BRCA2 mutation, making this population particularly vulnerable to HBOC.

Because HBOC is an inherited condition, having a family history of breast, ovarian, prostate, or related cancers increases the chance of carrying one of these mutations. If a parent has a BRCA1 or BRCA2 mutation, each of their children has a 50 percent chance of inheriting that same mutation.

How Is Hereditary Breast and Ovarian Cancer (HBOC) Diagnosed?

When you visit the doctor, they will carefully go through your medical history, your family history, and other details to determine the possibility of you carrying a cancer gene. Diagnosis of hereditary breast and ovarian cancer involves the following process:

1. Genetic testing confirms the HBOC and detects a hereditary mutation in any one of the BRCA genes.

2. Women with a family history of breast or ovarian cancer are asked to undergo genetic counseling. During counseling, a specialist in genetics will go through the person’s medical history, the family’s cancer history, and other details to estimate the probability of carrying a BRCA mutation. If the risk is high, genetic testing is suggested to confirm it.

3. Men diagnosed with breast cancer linked with HBOC are also asked to undergo genetic testing and counseling, as they may carry the same inherited mutations.

4. If a BRCA mutation is found in one family member, the close blood relatives, like siblings, children, or parents, are advised to test as well. This helps in early identification of HBOC risk and allows them to take preventive measures.

Is It Possible to Stay Away From HBOC?

For people with HBOC who want to have children but want to reduce the risk of passing on the BRCA mutation, medical options are available. One such method is preimplantation genetic diagnosis (PGD), which is used along with in vitro fertilization (IVF).

In this process, a woman’s eggs are collected, preserved, and fertilized in a laboratory to create embryos. When the embryos reach a certain stage of growth, one cell is carefully removed from each embryo and tested for the BRCA mutation. Only embryos without the mutation are then selected for transfer to the uterus, giving parents the chance to have a child free of the inherited condition.

PGD has been safely used for over 20 years to prevent many hereditary cancer syndromes. Before you plan for PGD, you should know that it is a complex process that involves physical, emotional, and financial factors. You must speak with a specialist or genetic counselor at a fertility center to fully understand the process and available options.

For Whom Should a BRCA1 and BRCA2 Mutation Test Be Performed?

The National Comprehensive Cancer Network (NCCN) recommends that individuals who fall under any of the following criteria must consider genetic counseling and testing for BRCA1 and BRCA2 mutations:

• A known harmful BRCA1 or BRCA2 mutation has already been found in the family,

• If any of the members in the family have had breast cancer before the age of 50.

• A person of Ashkenazi Jewish descent has been diagnosed with breast cancer at any age.

• Three or more relatives on the same side of the family have had breast cancer, regardless of age.

• A person has been diagnosed with multiple primary breast cancers (cancer in one or both breasts).

• People who are diagnosed with breast cancer at or before age 50.

• If ovarian cancer, fallopian tube cancer, or primary peritoneal cancer occurs at any age.

• Males, for breast cancer in men. It is uncommon but strongly associated with a BRCA mutation.

HBOC Genetic Counseling and Testing:

If you have a personal or family history of breast, ovarian, or related cancer, you must talk to your doctor. Your doctor will suggest that you see a genetic counselor or a specialist who will help you understand the benefits and risks of genetic testing for HBOC.

Under the U.S. Affordable Care Act, many health insurance plans cover BRCA genetic counseling and testing. However, coverage plans vary.

Can At-Home DNA Test Kits Be Used for BRCA Testing?

There are a few companies that offer at-home DNA test kits for BRCA testing; these tests typically check only a select few specific BRCA mutations.

According to the National Cancer Institute, this means a person could receive a negative result from an at-home test, even though they actually have a BRCA mutation that the test cannot detect. Because of this limitation, at-home testing results do not replace professional testing. A genetic counselor will explain the reports clearly, the cancer grade, and the next steps.

What Are the Treatments?

The treatment approach depends on the type and stage of cancer, as well as individual risk factors. The management options involve the following:

• Chemoprevention includes medications such as Tamoxifen, Raloxifene, or aromatase inhibitors, which are given to lower the breast cancer risk in women with a high genetic risk.

• Targeted therapy uses drugs like PARP (Poly (ADP-ribose) polymerase) inhibitors are specifically effective for patients with BRCA mutations. They are also used for active treatment or maintenance therapy to help control cancer growth.

• Surgical procedures involve lumpectomy (tumor removal) or mastectomy (removing one or both breasts). Surgery is advised based on the stage and extent of the cancer.

• Radiation therapy is often recommended after surgery to destroy any remaining cancer cells in and around the breast.

• Chemotherapy is a systemic treatment used to target and kill rapidly growing cancer cells, especially in advanced or aggressive cases.

• Hormonal therapy is used for hormone receptor-positive breast cancers to block or lower estrogen, which slows or stops the cancer growth.

• Immunotherapy is considered for certain advanced cancers, helping the body's immune system recognize and attack cancer cells.

• Genetic counseling and testing are essential for individuals with HBOC or those at risk. Genetic counselors guide you about family planning, further testing, and help you understand implications for other family members.

• Practicing healthy lifestyle habits will improve overall health. Psychological support and counseling are necessary to help the person and their families cope with emotional and physical challenges.

Conclusion:

Hereditary breast and ovarian cancer is caused by a mutation in the BRCA genes. Knowing your family history and considering testing with vigilant screenings will reduce the severity of cancer. With timely treatment like chemotherapy, targeted therapy, preventive care, and genetic counseling, people at risk of HBOC can manage their condition in a better way with a good life expectancy.

Key Takeaway/Note From iCliniq:

• HBOC is caused mainly by an inherited mutation in the BRCA1 and BRCA2 genes.

• It increases the risk of breast, ovarian, prostate, and pancreatic cancers.

• Targeted therapies and surgery help in treating the cancer by destroying the cancer cells.

• Genetic testing and counseling help identify individuals and families at higher risk. If you have a history of breast or ovarian cancer, you can ask an oncologist at iCliniq.